Integrated Autonomous Voltage Regulation and Islanding Detection for High Penetration PV Applications

This paper proposes an autonomous unified var controller to address the system voltage issues and unintentional islanding problems associated with distributed photovoltaic (PV) generation systems. The proposed controller features the integration of both voltage regulation (VR) and islanding detection (ID) functions in a PV inverter based on reactive power control. Compared with the individual VR or ID methods, the function integration exhibits several advantages in high PV penetration applications: 1) fast VR due to the autonomous control; 2) enhanced system reliability because of the capability to distinguish between temporary grid disturbances and islanding events; 3) negligible nondetection zone (NDZ) and no adverse impact on system power quality for ID; and 4) no interferences among multiple PV systems during ID. As the VR and ID functions are integrated in one controller, the controller is designed to fulfill the requirement of VR dynamic performance and ensure small ID NDZ simultaneously. The interaction among multiple PV systems during VR is also considered in the design procedure. Finally, the feasibility of the proposed controller and the controller design method is validated with simulation using a real-time digital simulator and a power hardware-in-the-loop testbed.

[1]  Xiaoyu Wang,et al.  Investigation of positive feedback anti-islanding control for multiple inverter-based distributed generators , 2009, 2009 IEEE Power & Energy Society General Meeting.

[2]  Richard S. Zhang,et al.  A grid simulator with control of single-phase power converters in D-Q rotating frame , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[3]  Bin Wu,et al.  Improved Active Frequency Drift Anti-islanding Detection Method for Grid Connected Photovoltaic Systems , 2012, IEEE Transactions on Power Electronics.

[4]  J. Bebic,et al.  Distribution System Voltage Performance Analysis for High-Penetration Photovoltaics , 2008 .

[5]  M. Steurer,et al.  Improve the Stability and the Accuracy of Power Hardware-in-the-Loop Simulation by Selecting Appropriate Interface Algorithms , 2008, IEEE Transactions on Industry Applications.

[6]  B. Kroposki,et al.  Renewable Systems Interconnection: Executive Summary , 2008 .

[7]  Y.A.-R.I. Mohamed,et al.  Hybrid Variable-Structure Control With Evolutionary Optimum-Tuning Algorithm for Fast Grid-Voltage Regulation Using Inverter-Based Distributed Generation , 2008, IEEE Transactions on Power Electronics.

[8]  M.E. Baran,et al.  A Multiagent-Based Dispatching Scheme for Distributed Generators for Voltage Support on Distribution Feeders , 2007, IEEE Transactions on Power Systems.

[9]  R. Belmans,et al.  Voltage fluctuations on distribution level introduced by photovoltaic systems , 2006, IEEE Transactions on Energy Conversion.

[10]  Hui Li,et al.  Autonomous control integrating fast voltage regulation and islanding detection for high penetration PV application , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[11]  W. Bower,et al.  Evaluation of Islanding Detection Methods for Utility-Interactive Inverters in Photovoltaic Systems , 2002 .

[12]  Michael Steurer,et al.  A Megawatt-Scale Power Hardware-in-the-Loop Simulation Setup for Motor Drives , 2010, IEEE Transactions on Industrial Electronics.

[13]  Zhihong Ye,et al.  Evaluation of anti-islanding schemes based on nondetection zone concept , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[14]  Raymond Hanus,et al.  Anti-windup, bumpless, and conditioned transfer techniques for PID controllers , 1996 .

[15]  Massimo Bongiorno,et al.  Input-Admittance Calculation and Shaping for Controlled Voltage-Source Converters , 2007, IEEE Transactions on Industrial Electronics.

[16]  Ehab F. El-Saadany,et al.  Impact of DG interface control on islanding detection and nondetection zones , 2006 .

[17]  Ronnie Belmans,et al.  International harmonization of grid connection guidelines: adequate requirements for the prevention of unintentional islanding , 2003 .

[18]  Pedro Rodriguez,et al.  Evaluation of the voltage support strategies for the low voltage grid connected PV generators , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[19]  R. Hara,et al.  Testing the technologies , 2009, IEEE Power and Energy Magazine.

[20]  Fangxing Li,et al.  Adaptive Voltage Control With Distributed Energy Resources: Algorithm, Theoretical Analysis, Simulation, and Field Test Verification , 2011, IEEE Transactions on Power Systems.

[21]  Lingling Fan,et al.  Positive-Feedback-Based Active Anti-Islanding Schemes for Inverter-Based Distributed Generators: Basic Principle, Design Guideline and Performance Analysis , 2010, IEEE Transactions on Power Electronics.

[22]  Jian Sun,et al.  Impedance-Based Stability Criterion for Grid-Connected Inverters , 2011, IEEE Transactions on Power Electronics.

[23]  Hui Li,et al.  A Cascaded Photovoltaic System Integrating Segmented Energy Storages With Self-Regulating Power Allocation Control and Wide Range Reactive Power Compensation , 2011, IEEE Transactions on Power Electronics.

[24]  L.A.F. Ferreira,et al.  Distributed Reactive Power Generation Control for Voltage Rise Mitigation in Distribution Networks , 2008, IEEE Transactions on Power Systems.

[25]  D. G. Holmes,et al.  Optimized Design of Stationary Frame Three Phase AC Current Regulators , 2009, IEEE Transactions on Power Electronics.

[26]  Gabriel Garcera,et al.  An Active Anti-Islanding Method Based on Phase-PLL Perturbation , 2011, IEEE Transactions on Power Electronics.

[27]  Yongzheng Zhang,et al.  Islanding Detection Assessment of Multi-Inverter Systems With Active Frequency Drifting Methods , 2008, IEEE Transactions on Power Delivery.

[28]  H.H. Zeineldin,et al.  A $Q$– $f$ Droop Curve for Facilitating Islanding Detection of Inverter-Based Distributed Generation , 2009, IEEE Transactions on Power Electronics.

[29]  Chung-Yuen Won,et al.  An Islanding Detection Method for a Grid-Connected System Based on the Goertzel Algorithm , 2011, IEEE Transactions on Power Electronics.